Signal amplifier for mobile phone



FIG. 1 is a front perspective view of a signal amplifier for mobile phone showing my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines in the drawings represent unclaimed environmental subject matter that forms no part of the claim. 

CLAIM The ornamental design for a signal amplifier for mobile phone, as shown and described. 